I thought Panasonic did only do consumer electronics?;p
Google brought up this:
Designed to streamline home communications and make a host of advanced features available to each extension in your home. (this system KX-TA624 has been discontinued and replaced with the new KX-TA824)
Off-Premises Call Forwarding
Program the system to forward your calls to your cellular phone or another outside telephone so you don't miss a call.
Single-Line Device Integration
Connect many types of single-line telephone devices such as answering machines, cordless phones, fax machines and computer modems directly to the system without the need for additional cards or modules. There's no need to buy new equipment or incur expensive upgrade costs.
Direct Inward System Access (DISA)
Addition of an optional DISA card provides a great solution for families and businesses members who share one telephone line. Incoming callers hear a message instructing them to dial a single-digit code for the intended party, and the caller is then routed to that person's extension automatically. Each person can field their own calls and have their own answering machine, even though they share the same line.
Night Mode
Automatically prevent selected extensions from ringing at night-ideal for children's rooms or a home office.
Toll Restriction
Prohibits unauthorized long distance calling from specified extensions by blocking selected area/exchange codes.
Call Waiting Caller ID
System display phones can show the name and number of an incoming caller, even if you're on another call. The system can log up to 20 unanswered calls per extension and up to 300 calls system-wide, making it easy for you to return missed calls.
Room-to-Room Intercom
Lets you contact other extensions via an intercom, so you can relay messages throughout your home or office.
Flexible Ringing Assignment
Allows you to decide which phones will ring on each line to help you customize your phone system.
Expand Your New System as Your Needs Grow
Hybrid telephone systems work with standard telephone lines, so you never need to upgrade your phone service when your needs increase. You can easily expand from 3 central office lines and 8 stations to 6 CO lines and 24 stations (KX-TA824) or from 8 CO lines and 16 stations to 12 CO lines and 32 stations (KX-TA1232), with the addition of plug-in cards.
Sounds as a very sophisticated system from the past century.
Any telecomms installer with a little self-respect would never offer a piece of garbage like that anymore.
I can remember that system from twenty years ago or even more, it was crap then and it still is.